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Centre operation
t
t
t
t
introduced above 24,500ft, the 8.33kHz
requirement has now been lowered to
19,500ft and EUROCONTROL is working on
the complex issues associated with lowering
it still further.
The wider adoption of Mode-S transponders
during the decade has also helped
to increase capacity and improve safety.
Transponders encode ATC radar with information
specifi c to each aircraft, but the
unsophisticated nature of earlier transponders
led to cluttering of screens, overlapping
of signals and ambiguity of information,
referred to by controllers as ‘garble’
and ‘fruit’. Mode-S transponders provide an
uncorrupted signal that often allows more
effi cient use of airspace.
Again, aircraft operators must be convinced
there’s a payback in terms of increased
effi ciency before they will pay for the
equipment, and among airlines EUROCONTROL’s
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
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Reaching for the Single European Sky(75)
